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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1111/j.1469-8137.2010.03427.x
|2 doi
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|a DE-627
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|e rakwb
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|a eng
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|a de Graaff, Marie-Anne
|e verfasserin
|4 aut
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|a Labile soil carbon inputs mediate the soil microbial community composition and plant residue decomposition rates
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|c 2010
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 15.02.2011
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|a Date Revised 02.04.2021
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a No claim to original US government works. Journal compilation © New Phytologist Trust (2010).
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|a Root carbon (C) inputs may regulate decomposition rates in soil, and in this study we ask: how do labile C inputs regulate decomposition of plant residues, and soil microbial communities? In a 14 d laboratory incubation, we added C compounds often found in root exudates in seven different concentrations (0, 0.7, 1.4, 3.6, 7.2, 14.4 and 21.7 mg C g(-1) soil) to soils amended with and without (13) C-labeled plant residue. We measured CO(2) respiration and shifts in relative fungal and bacterial rRNA gene copy numbers using quantitative polymerase chain reaction (qPCR). Increased labile C input enhanced total C respiration, but only addition of C at low concentrations (0.7 mg C g(-1)) stimulated plant residue decomposition (+2%). Intermediate concentrations (1.4, 3.6 mg C g(-1)) had no impact on plant residue decomposition, while greater concentrations of C (>7.2 mg C g(-1)) reduced decomposition (-50%). Concurrently, high exudate concentrations (>3.6 mg C g(-1)) increased fungal and bacterial gene copy numbers, whereas low exudate concentrations (<3.6 mg C g(-1)) increased metabolic activity rather than gene copy numbers. These results underscore that labile soil C inputs can regulate decomposition of more recalcitrant soil C by controlling the activity and relative abundance of fungi and bacteria
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|a Journal Article
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Soil
|2 NLM
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|a Carbon Dioxide
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|a Carbon
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|a Classen, Aimee T
|e verfasserin
|4 aut
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|a Castro, Hector F
|e verfasserin
|4 aut
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|a Schadt, Christopher W
|e verfasserin
|4 aut
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|i Enthalten in
|t The New phytologist
|d 1979
|g 188(2010), 4 vom: 15. Dez., Seite 1055-64
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|x 1469-8137
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|g year:2010
|g number:4
|g day:15
|g month:12
|g pages:1055-64
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